If you are using a quality synthetic, it's probably be OK. I was referring to the labels of the synthetic brands. I've seen the result of dino ATF in a 246, and it wasn't pretty. The clutch surfaces were coked, and the syncro's were scored pretty bad. I suspect dino fluid fails at the temp of the friction surfaces during operation. Much like a failing auto tranny when it starts to slip, the fluid gets cooked in the hot spots. I know of a few using Amsoil and Mobil 1 synthetic, and they seem to be fine. Contact the supplier of your fluid to confirm compatibility, but I wouldn't lose sleep over it.